<h2>Atoms whose atomic number are the same but whose mass numbers are different are called : Isotopes </h2>
Explanation:
Isotopes 
They are the   elements with same atomic number but different mass number .
for example : Protium , deuterium and tritium are isotopes of hydrogen .
                     : C-14 and C-12 are isotopes of oxygen .
                      : Cl-35.5 and Cl-37 are isotopes of chlorine 
Alpha particles 
They are helium nuclei with +2 unit charge and 4 a.m.u mass 
They are represented as : He₂⁴.
Ions 
The atom carrying charge is called as ion .
It can be of two types : Cation and anion 
cation :atom with positive charge 
Anion : atom with negative charge 
Beta particles 
They are actually particles with charge and mass of electron and is represented as :₀ e⁻¹
 
        
             
        
        
        
Answer:
B) H2SO4 (aq) + Ca(OH)2 (aq) → CaSO4 (aq) + 2 H2O(l)
Explanation:
A is a reaction between a salt FeCl3 and a base KOH
C is a n acid decomposing on it's own to form two products
D is mercury, a metal reacting with oxygen. Two elements reacting. Neither are an acid or a base
E. is an acid reacting with a metal to liberate hydrogen. There is no base
 
        
             
        
        
        
Answer: Most methods for making new elements involve a cyclotron, which speeds up atoms to high velocities before they smash into other atoms—these atoms are usually of different elements. This causes the nuclei to combine, creating new heavier elements.
Explanation: How are superheavy elements made?
 
        
             
        
        
        
Because if you change two things then you do not know which one has affected or altered the dependent variable.  if you only change one then you know what exactly changed and why
        
             
        
        
        
Answer:
I know someone that has the answer
Explanation:
I know someone that has the answer